Quality and Process Methods • Shewhart Control Charts • Statistical Details for the Control Chart Platform • Control Limits for Median Moving Range Charts
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Control Limits for Median Moving Range Charts
Control limits for Median Moving Range charts are computed as follows.
LCLMMR = max(0, MMR - kd3(n))
UCLMMR = MMR + kd3(n)
where:
MMR is the median of the nonmissing moving ranges.
= MMR/0.954
d3(n) is the standard deviation of the range of n independent observations from a normal population with unit standard deviation.

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Help created on 10/11/2018